usb storage not a block device ???

usb storage not a block device ???

[G.ridolfi]

Hello everybody 

I' running Debian GNU/Linux unstable

udev 0.080-1, linux-image-2.6.15-2

My rule for the mp3 player and usb storage
Creative MuVo TXFM _partially_ fails  in
creating the device. 
Udev creates a "c" device but not a *block* device .

a) "sd*" devices in /dev/ directory are missing
b) udevinfo -a -p does not return any 
   message like kernel="sd" or subsystem="vfat"

How can udev and I create a block device?

TIA

Giovanni 
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Re: usb storage not a block device ???

[Alexander E. Patrakov]

G.ridolfi wrote:

>Hello everybody 
>
>I' running Debian GNU/Linux unstable
>
>udev 0.080-1, linux-image-2.6.15-2
>
>My rule for the mp3 player and usb storage
>Creative MuVo TXFM _partially_ fails  in
>creating the device. 
>Udev creates a "c" device but not a *block* device .
>  
>
Sorry, I don't completely understand. Please provide the output of: ls 
-l /dev/what-udev-created.

>a) "sd*" devices in /dev/ directory are missing
>b) udevinfo -a -p does not return any 
>   message like kernel="sd" or subsystem="vfat"
>
>How can udev and I create a block device?
>  
>
You mentioned that you have some special rule for that player. Can we 
see it? Do things work without it? Do other USB storage devices work?

-- 
Alexander E. Patrakov


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Re: usb storage not a block device ???

[Moshe Yudkowsky]

Alexander E. Patrakov wrote:
> G.ridolfi wrote:
> 
>> Hello everybody
>> I' running Debian GNU/Linux unstable
>>
>> udev 0.080-1, linux-image-2.6.15-2
>>
>> My rule for the mp3 player and usb storage
>> Creative MuVo TXFM _partially_ fails  in
>> creating the device. Udev creates a "c" device but not a *block* device .
>>  
>>
> Sorry, I don't completely understand. Please provide the output of: ls 
> -l /dev/what-udev-created.

Block devices are created by a kernel module such as usb_storage. You 
probably ought to include the output of "lsmod" in your next email.


-- 
  Moshe Yudkowsky
  work: http://www.Disaggregate.com
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Re: usb storage not a block device ???

[G.ridolfi]

Data: 19/01/06 19:36 Moshe Yudkowsky wrote
> 
> Alexander E. Patrakov wrote:
> > G.ridolfi wrote:
> > 
> >> Hello everybody
> >> I' running Debian GNU/Linux unstable
> >>
> >> udev 0.080-1, linux-image-2.6.15-2
> >>
> >> My rule for the mp3 player and usb storage
> >> Creative MuVo TXFM _partially_ fails  in
> >> creating the device. Udev creates a "c" device but not a *block* device
.
> >>  
> >>
> > Sorry, I don't completely understand. Please provide the output of: ls 
> > -l /dev/what-udev-created.

crw-rw-r-- 1 root root  189, 386 2006-01-19 22:05 /dev/muvoTXFM
^
Isn't /dev/muvoTXFM a console device?

> 
> Block devices are created by a kernel module such as usb_storage. You 
> probably ought to include the output of "lsmod" in your next email.

here it is:

Module                  Size  Used by
uinput                 10400  2 
ipv6                  296836  10 
ipt_limit               2464  8 
iptable_mangle          2976  0 
ipt_LOG                 7072  8 
ipt_MASQUERADE          3712  0 
ipt_TOS                 2688  0 
ipt_REJECT              6528  1 
ip_conntrack_irc        7340  0 
ipt_state               1952  6 
iptable_filter          3168  1 
ip_tables              22048  8
ipt_limit,iptable_mangle,ipt_LOG,ipt_MASQUERADE,ipt_TOS,ipt_REJECT,ipt_state,iptable_filter
ip_nat_ftp              3840  0 
ip_nat                 21264  2 ipt_MASQUERADE,ip_nat_ftp
ip_conntrack_ftp        8496  1 ip_nat_ftp
ip_conntrack           63824  6
ipt_MASQUERADE,ip_conntrack_irc,ipt_state,ip_nat_ftp,ip_nat,ip_conntrack_ftp
nfnetlink               7448  2 ip_nat,ip_conntrack
sungem                 37188  0 
sungem_phy             10080  1 sungem
ohci1394               40564  0 
vfat                   14688  0 
fat                    59836  1 vfat
ehci_hcd               36712  0 
ohci_hcd               23780  0 
uhci_hcd               44496  0 
usbhid                 55108  0 
usbcore               147136  5 ehci_hcd,ohci_hcd,uhci_hcd,usbhid
therm_adt746x          13352  0 
sr_mod                 20420  0 
snd_powermac           51552  2 
snd_pcm_oss            63648  1 
snd_mixer_oss          21536  1 snd_pcm_oss
snd_pcm               102788  2 snd_powermac,snd_pcm_oss
snd_timer              27620  1 snd_pcm
snd                    67412  7
snd_powermac,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer
soundcore              11172  2 snd
snd_page_alloc         11656  1 snd_pcm
sbp2                   26340  0 
scsi_mod              170276  2 sr_mod,sbp2
ieee1394              428176  2 ohci1394,sbp2
ide_cd                 47588  0 
cdrom                  44028  2 sr_mod,ide_cd
joydev                 11872  0 
ext3                  154632  4 
jbd                    68564  1 ext3
mbcache                10980  1 ext3
ide_disk               19648  6 
evdev                  11808  9 

> > You mentioned that you have some special rule for that player.
> > Can we see it?
Here it is:
----- file: /etc/udev/rules.d/010-muvo.rules -------
# MuVo TXFM
#
BUS="usb",  SYSFS{product}="MuVo TX FM", NAME="muvoTXFM", 
OPTIONS+="all_partitions"
------------------------eof ---------

> > Do things work without it?
Well, obviously kernel and udev recognised the device ...
I can see it in the output of "dmesg" and in /var/log/messages

The diff between `ls -lR /dev/` before and after the pluging-in
of MuVo reveals that a new console device created in

/dev/bus/usb/004:
crw-rw-r-- 1 root root 189, 389 2006-01-19 22:30 006
^

Then I don't know how I could have access to the pen.

> > Do other USB storage devices work?
I haven't tried yet.
However I can read and write MuVo  with both MacOSX and winxp.

Will the output of udevinfo help in any way?

Giovanni 
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Re: usb storage not a block device ???

[Alexander E. Patrakov]

G.ridolfi wrote:

>crw-rw-r-- 1 root root  189, 386 2006-01-19 22:05 /dev/muvoTXFM
>^
>Isn't /dev/muvoTXFM a console device?
>  
>
What happens here is that your rule matches several devices, including 
the wrong "usb generic" one.

>BUS="usb",  SYSFS{product}="MuVo TX FM", NAME="muvoTXFM", 
>OPTIONS+="all_partitions"
>  
>
I'd suggest adding KERNEL="sd*", or, if you use the slow "ub" driver, 
KERNEL="ub*" in front of this rule.

-- 
Alexander E. Patrakov


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Re: usb storage not a block device ???

[Kay Sievers]

On Fri, Jan 20, 2006 at 03:04:23PM +0500, Alexander E. Patrakov wrote:
> G.ridolfi wrote:
> 
> >crw-rw-r-- 1 root root  189, 386 2006-01-19 22:05 /dev/muvoTXFM
> >^
> >Isn't /dev/muvoTXFM a console device?
> > 
> >
> What happens here is that your rule matches several devices, including 
> the wrong "usb generic" one.
> 
> >BUS="usb",  SYSFS{product}="MuVo TX FM", NAME="muvoTXFM", 
> >OPTIONS+="all_partitions"
> > 
> >
> I'd suggest adding KERNEL="sd*", or, if you use the slow "ub" driver, 
> KERNEL="ub*" in front of this rule.

Just match on SUBSYSTEM="block".

Kay


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Re: usb storage not a block device ???

[G.ridolfi]

Data: 20/01/06 12:48 Kay Sievers wrote:
> 
> On Fri, Jan 20, 2006 at 03:04:23PM +0500, Alexander E. Patrakov wrote:
> > G.ridolfi wrote:
> > 
> > >crw-rw-r-- 1 root root  189, 386 2006-01-19 22:05 /dev/muvoTXFM
> > >^
> > >Isn't /dev/muvoTXFM a console device?
> > > 
> > >
> > What happens here is that your rule matches several devices, including 
> > the wrong "usb generic" one.
> > 
> > >BUS="usb",  SYSFS{product}="MuVo TX FM", NAME="muvoTXFM", 
> > >OPTIONS+="all_partitions"
> > > 
> > >
> > I'd suggest adding KERNEL="sd*", or, if you use the slow "ub" driver, 
> > KERNEL="ub*" in front of this rule.

I changed the rule according to your suggestion:
------rule
BUS="usb", SYSFS{product}="MuVo TX FM", NAME="muvoTXFM", KERNEL="sd*" 
-------
#/etc/init.d/udev restart
# ls -lR /dev/ > ls-before
Inserted MuVo
# ls -lr /dev/> ls-after
# diff ls-before ls-after:

[two files were recreated when I inserted MuVo: xconsole and
/dev/bus/usb/004 ]
4c4
< prw-r----- 1 root adm            0 2006-01-20 11:55 xconsole
---
> prw-r----- 1 root adm            0 2006-01-20 11:57 xconsole
186c186
< drwxr-xr-x 2 root root 60 2006-01-20 11:55 004
---
> drwxr-xr-x 2 root root 80 2006-01-20 11:57 004

[a new file was created:/dev/bus/usb/004/004:]
192a193
> crw-rw-r-- 1 root root 189, 387 2006-01-20 11:57 004

But I cannot acces MuVo

> 
> Just match on SUBSYSTEM="block".
> 
I cannot find any  << SUBSYSTEM="block" >> in what the kernel reads
:-(
# udevinfo -a -p

udevinfo starts with the device the node belongs to and then walks up the
device chain, to print for every device found, all possibly useful
attributes
in the udev key format.
Only attributes within one device section may be used together in one rule,
to match the device for which the node will be created.

  looking at device '/devices/pci0001:10/0001:10:1b.2/usb4/4-1/4-1:1.0':
    KERNEL="4-1:1.0"
    SUBSYSTEM="usb"
    SYSFS{interface}="Internal Flash Device"
    SYSFS{modalias}="usb:v041Ep4120d1123dc00dsc00dp00ic08isc06ip50"
    SYSFS{bInterfaceProtocol}="50"
    SYSFS{bInterfaceSubClass}="06"
    SYSFS{bInterfaceClass}="08"
    SYSFS{bNumEndpoints}="02"
    SYSFS{bAlternateSetting}=" 0"
    SYSFS{bInterfaceNumber}="00"

looking at device '/devices/pci0001:10/0001:10:1b.2/usb4/4-1':
    ID="4-1"
    BUS="usb"
    DRIVER="usb"
    SYSFS{configuration}="Media"
    SYSFS{serial}="0002F5CF71A10D83"
    SYSFS{product}="MuVo TX FM"
    SYSFS{manufacturer}="CREATIVE"
    SYSFS{maxchild}="0"
    SYSFS{version}=" 2.00"
    SYSFS{devnum}="2"
    SYSFS{speed}="480"
    SYSFS{bMaxPacketSize0}="64"
    SYSFS{bNumConfigurations}="1"
    SYSFS{bDeviceProtocol}="00"
    SYSFS{bDeviceSubClass}="00"
    SYSFS{bDeviceClass}="00"
    SYSFS{bcdDevice}="1123"
    SYSFS{idProduct}="4120"
    SYSFS{idVendor}="041e"
    SYSFS{bMaxPower}="100mA"
    SYSFS{bmAttributes}="80"
    SYSFS{bConfigurationValue}="1"
    SYSFS{bNumInterfaces}=" 1"

  looking at device '/devices/pci0001:10/0001:10:1b.2/usb4':
    ID="usb4"
    BUS="usb"
    DRIVER="usb"
    SYSFS{configuration}=""
    SYSFS{serial}="0001:10:1b.2"
    SYSFS{product}="EHCI Host Controller"
    SYSFS{manufacturer}="Linux 2.6.15-1-powerpc ehci_hcd"
    SYSFS{maxchild}="5"
    SYSFS{version}=" 2.00"
    SYSFS{devnum}="1"
    SYSFS{speed}="480"
SYSFS{bMaxPacketSize0}="64"
    SYSFS{bNumConfigurations}="1"
    SYSFS{bDeviceProtocol}="01"
    SYSFS{bDeviceSubClass}="00"
    SYSFS{bDeviceClass}="09"
    SYSFS{bcdDevice}="0206"
    SYSFS{idProduct}="0000"
    SYSFS{idVendor}="0000"
    SYSFS{bMaxPower}="  0mA"
    SYSFS{bmAttributes}="c0"
    SYSFS{bConfigurationValue}="1"
    SYSFS{bNumInterfaces}=" 1"

  looking at device '/devices/pci0001:10/0001:10:1b.2':
    ID="0001:10:1b.2"
    BUS="pci"
    DRIVER="ehci_hcd"
    SYSFS{devspec}="/pci@f2000000/usb@1b_2"
    SYSFS{modalias}="pci:v00001033d000000E0sv00001033sd000000E0bc0Csc03i20"
    SYSFS{local_cpus}="1"
    SYSFS{irq}="63"
    SYSFS{class}="0x0c0320"
    SYSFS{subsystem_device}="0x00e0"
    SYSFS{subsystem_vendor}="0x1033"
    SYSFS{device}="0x00e0"
    SYSFS{vendor}="0x1033"

  looking at device '/devices/pci0001:10':
    ID="pci0001:10"
    BUS=""
    DRIVER=""
----------------------

Giovanni 
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Re: usb storage not a block device ???

[Moshe Yudkowsky]

> I cannot find any  << SUBSYSTEM="block" >> in what the kernel reads
> :-(
> # udevinfo -a -p

I suggest you "modprobe usb_storage" and then see if you get "block."

-- 
  Moshe Yudkowsky
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Re: usb storage not a block device ???

[G.ridolfi]

Data: 20/01/06 19:55 Moshe Yudkowsky 

> Giovanni Ridolfi 
> 
> > I cannot find any  << SUBSYSTEM="block" >> in what the kernel reads
> > :-(
> > # udevinfo -a -p
> 
> I suggest you "modprobe usb_storage" and then see if you get "block."
> 
# modprobe usb_storage
# dmesg
Initializing USB Mass Storage driver...
usbcore: registered new driver usb-storage
USB Mass Storage support registered.
usb 4-1: new high speed USB device using ehci_hcd and address 3
scsi0 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 3
usb-storage: waiting for device to settle before scanning

#tail /var/log/messages:
Jan 21 08:46:01 localhost kernel: Initializing USB Mass Storage driver...
Jan 21 08:46:01 localhost kernel: usbcore: registered new driver usb-storage
Jan 21 08:46:01 localhost kernel: USB Mass Storage support registered.
Jan 21 08:46:05 localhost kernel: usb 4-1: new high speed USB device using
ehci_hcd and address 3
Jan 21 08:46:06 localhost kernel: scsi0 : SCSI emulation for USB Mass
Storage devices
Jan 21 08:46:11 localhost kernel:   Vendor: CREATIVE  Model: MuVo TX FM     
  Rev: 1123
Jan 21 08:46:11 localhost kernel:   Type:   Direct-Access
ANSI SCSI revision: 04

However /dev/muvo is created but...
#ls -l 
crw-rw-r-- 1 root root  189, 387 2006-01-21 08:49 /dev/muvoTXFM

Still is not a block device.
Also the indormation of udevinfo are the same I got without "modprobe
usb_storage"

--------------------- I got another usb storage device.
# dmesg
usb 4-1: new high speed USB device using ehci_hcd and address 5
hub 4-1:1.0: USB hub found
hub 4-1:1.0: 1 port detected
usb 4-1.1: new high speed USB device using ehci_hcd and address 6
ehci_hcd 0001:10:1b.2: qh eec19180 (#00) state 4
scsi2 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 6
usb-storage: waiting for device to settle before scanning
  Vendor: EUDAR     Model: Marchi2.0         Rev: P1.0
  Type:   Direct-Access                      ANSI SCSI revision: 00
usb-storage: device scan complete

# udevinfo -a -p /sys/devices/pci0001\:10/0001\:10\:1b.2/usb4/4-1/4-1\:1.0/

udevinfo starts with the device the node belongs to and then walks up the
device chain, to print for every device found, all possibly useful
attributes
in the udev key format.
Only attributes within one device section may be used together in one rule,
to match the device for which the node will be created.

  looking at device '/devices/pci0001:10/0001:10:1b.2/usb4/4-1/4-1:1.0':
    KERNEL="4-1:1.0"
    SUBSYSTEM="usb"
    SYSFS{modalias}="usb:v067Bp2515d0001dc09dsc00dp01ic09isc00ip00"
    SYSFS{bInterfaceProtocol}="00"
    SYSFS{bInterfaceSubClass}="00"
    SYSFS{bInterfaceClass}="09"
    SYSFS{bNumEndpoints}="01"
    SYSFS{bAlternateSetting}=" 0"
    SYSFS{bInterfaceNumber}="00"

  looking at device '/devices/pci0001:10/0001:10:1b.2/usb4/4-1':
    ID="4-1"
    BUS="usb"
    DRIVER="usb"
    SYSFS{configuration}=""
    SYSFS{product}="USB Embedded Hub"
    SYSFS{manufacturer}="EUDAR Technology Inc."
    SYSFS{maxchild}="1"
    SYSFS{version}=" 2.00"
    SYSFS{devnum}="5"
    SYSFS{speed}="480"
    SYSFS{bMaxPacketSize0}="64"
    SYSFS{bNumConfigurations}="1"
    SYSFS{bDeviceProtocol}="01"
    SYSFS{bDeviceSubClass}="00"
    SYSFS{bDeviceClass}="09"
    SYSFS{bcdDevice}="0001"
    SYSFS{idProduct}="2515"
    SYSFS{idVendor}="067b"
    SYSFS{bMaxPower}="100mA"
    SYSFS{bmAttributes}="c0"
    SYSFS{bConfigurationValue}="1"
    SYSFS{bNumInterfaces}=" 1"

  looking at device '/devices/pci0001:10/0001:10:1b.2/usb4':
    ID="usb4"
    BUS="usb"
    DRIVER="usb"
    SYSFS{configuration}=""
    SYSFS{serial}="0001:10:1b.2"
    SYSFS{product}="EHCI Host Controller"
    SYSFS{manufacturer}="Linux 2.6.15-1-powerpc ehci_hcd"
    SYSFS{maxchild}="5"
    SYSFS{version}=" 2.00"
    SYSFS{devnum}="1"
    SYSFS{speed}="480"
    SYSFS{bMaxPacketSize0}="64"
    SYSFS{bNumConfigurations}="1"
    SYSFS{bDeviceProtocol}="01"
    SYSFS{bDeviceSubClass}="00"
    SYSFS{bDeviceClass}="09"
    SYSFS{bcdDevice}="0206"
    SYSFS{idProduct}="0000"
    SYSFS{idVendor}="0000"
    SYSFS{bMaxPower}="  0mA"
    SYSFS{bmAttributes}="c0"
    SYSFS{bConfigurationValue}="1"
    SYSFS{bNumInterfaces}=" 1"

  looking at device '/devices/pci0001:10/0001:10:1b.2':
    ID="0001:10:1b.2"
    BUS="pci"
    DRIVER="ehci_hcd"
    SYSFS{devspec}="/pci@f2000000/usb@1b_2"
    SYSFS{modalias}="pci:v00001033d000000E0sv00001033sd000000E0bc0Csc03i20"
    SYSFS{local_cpus}="1"
    SYSFS{irq}="63"
    SYSFS{class}="0x0c0320"
    SYSFS{subsystem_device}="0x00e0"
    SYSFS{subsystem_vendor}="0x1033"
    SYSFS{device}="0x00e0"
    SYSFS{vendor}="0x1033"

  looking at device '/devices/pci0001:10':
    ID="pci0001:10"
    BUS=""
    DRIVER=""

No "sd" or "block" information and I don't know where and if a device
has been created to access the EUDAR.

Giovanni 
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Re: usb storage not a block device ???

[Andrey Borzenkov]

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Hash: SHA1

On Saturday 21 January 2006 11:14, G.ridolfi wrote:
> Data: 20/01/06 19:55 Moshe Yudkowsky
>
> > Giovanni Ridolfi
> >
> > > I cannot find any  << SUBSYSTEM="block" >> in what the kernel reads
> > >
> > > :-(
> > >
> > > # udevinfo -a -p
> >
> > I suggest you "modprobe usb_storage" and then see if you get "block."
>
> # modprobe usb_storage
> # dmesg
> Initializing USB Mass Storage driver...
> usbcore: registered new driver usb-storage
> USB Mass Storage support registered.
> usb 4-1: new high speed USB device using ehci_hcd and address 3
> scsi0 : SCSI emulation for USB Mass Storage devices
> usb-storage: device found at 3
> usb-storage: waiting for device to settle before scanning
>

And now you have to load sd_mod that is missing in lsmod output you sent 
earlier. Once upon a time it was done by hotplug. I do not know if Gentoo is 
still using hotplug or converted hotplug rules to udev. In the latter case we 
(Mandriva community) found a bug that SCSI subsystem requires wait_for_sysfs 
otherwise it cannot probe device type and does not load proper module. I,e, 
from current udev rules here:

# disks & magneto-optical disk:
ACTION="add", SUBSYSTEM="scsi", WAIT_FOR_SYSFS="type", SYSFS{type}="[07]", 
\
              RUN+="/sbin/modprobe sd_mod"

> However /dev/muvo is created but...
> #ls -l
> crw-rw-r-- 1 root root  189, 387 2006-01-21 08:49 /dev/muvoTXFM
>
> Still is not a block device.
[...]
> # udevinfo -a -p /sys/devices/pci0001\:10/0001\:10\:1b.2/usb4/4-1/4-1\:1.0/
>

Irrelevant. This is created by usbhid. If you want to rename (that I strongly 
NOT recommend) or give alias to your USB stick your old rule should work, use 
SYMLINK

SYSFS{product}="MuVo TX FM", SYMLINK+="muvoTXFM", KERNEL="sd*"

BTW with your all rule you will never see /dev/sda at all because you change 
the name from default to custom.

Also udev already creates persistent (are they really BTW?) rules for you:

{pts/1}% LC_ALL=C ll /dev/disk/by-id
total 0
lrwxrwxrwx  1 root root  9 Jan 21 11:12 ata-IC25N020ATDA04-0_63A63GY1081 
- -> ../../hda
lrwxrwxrwx  1 root root 10 Jan 21 11:12 ata-IC25N020ATDA04-0_63A63GY1081-part1 
- -> ../../hda1
lrwxrwxrwx  1 root root 10 Jan 21 11:12 ata-IC25N020ATDA04-0_63A63GY1081-part2 
- -> ../../hda2
lrwxrwxrwx  1 root root  9 Jan 21 11:12 usb-USB_128MB_241F41AFDD0D006D 
- -> ../../sda
lrwxrwxrwx  1 root root 10 Jan 21 11:12 usb-USB_128MB_241F41AFDD0D006D-part1 
- -> ../../sda1

may be you just can use them?

- -andrey
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Re: usb storage not a block device ???

[G.ridolfi]

Data: 21/01/06 09:51   Da: Andrey Borzenkov

> On Saturday 21 January 2006 11:14, G.ridolfi wrote:
> > Data: 20/01/06 19:55 Moshe Yudkowsky
> >
> > Giovanni Ridolfi
> > >
> > > > I cannot find any  << SUBSYSTEM="block" >> in what the kernel reads
> > >
> > > I suggest you "modprobe usb_storage" and then see if you get "block."
> >
> > # modprobe usb_storage
> > # dmesg
> > Initializing USB Mass Storage driver...
> > usbcore: registered new driver usb-storage
> > USB Mass Storage support registered.
> > usb 4-1: new high speed USB device using ehci_hcd and address 3
> > scsi0 : SCSI emulation for USB Mass Storage devices
> > usb-storage: device found at 3
> > usb-storage: waiting for device to settle before scanning
> >
>
> And now you have to load sd_mod that is missing in lsmod output you sent
> earlier. 
Oh yes!!!!

I've just mounted and read mboth the storage devices! Thank you very
very much Andrey!

:-) me happy.

> we
> (Mandriva community) found a bug that SCSI subsystem requires
> wait_for_sysfs
> otherwise it cannot probe device type and does not load proper module.
> I,e, from current udev rules here:
>
> # disks & magneto-optical disk:
> ACTION="add", SUBSYSTEM="scsi", WAIT_FOR_SYSFS="type",
> SYSFS{type}="[07]",
>
>               RUN+="/sbin/modprobe sd_mod"
>

I tried to add these lines to /etc/udev.rules
then
# rmmod sd_mod usb_storage
# /etc/init.d/udev restart

then I plugged in the usb, but nothing happened

So I
# modprobe  usb_storage ;modprobe sd_mod

and I can access the device 

Could you please suggest me in which rule I shall write your code.

> > However /dev/muvo is created but...
>
> Irrelevant. This is created by usbhid. If you want to rename (that I
> strongly NOT recommend) 

I strongly agreee with you /now/ ;)  The device is detected when inserted
and I can mount it and access to it via a gnome applet. 
I removed my rule ;)

> Also udev already creates persistent (are they really BTW?) rules for you:
>
>
> {pts/1}% LC_ALL=C ll /dev/disk/by-id
> total 0
> lrwxrwxrwx  1 root root  9 Jan 21 11:12 ata-IC25N020ATDA04-0_63A63GY1081
> - -> ../../hda
> lrwxrwxrwx  1 root root 10 Jan 21 11:12
ata-IC25N020ATDA04-0_63A63GY1081-part1
> - -> ../../hda1
> lrwxrwxrwx  1 root root 10 Jan 21 11:12
ata-IC25N020ATDA04-0_63A63GY1081-part2
> - -> ../../hda2
> lrwxrwxrwx  1 root root  9 Jan 21 11:12 usb-USB_128MB_241F41AFDD0D006D
> - -> ../../sda
> lrwxrwxrwx  1 root root 10 Jan 21 11:12
usb-USB_128MB_241F41AFDD0D006D-part1
> - -> ../../sda1
>
> may be you just can use them?
>
Well I don't have such a /dev(/disk/by-id) directory with the symlinks

Thank you again,

Giovanni 
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